MailPixel is an email tracking tool that generates a hosted tracking pixel and a separate private link for viewing its activity report. Each valid request for the pixel image can create a timestamped event. The service retains pixel activity for up to 30 days, applies a request cap, and allows the person with the private link to pause or delete the pixel. Creating a pixel does not itself generate an activity event. Users can copy the pixel URL or HTML snippet into an email workflow that supports remote HTML images, then use the private link to review image requests. The public image URL does not contain access to the report. Private links are stored in the browser and cannot be recovered if lost; anyone with access to the same browser profile may also be able to open or manage them. MailPixel advises against entering email addresses, message content, or personal data in pixel labels. A pixel request indicates that the image was requested, but does not prove that a recipient read the email. Image blocking, caching, and other email client behavior can affect tracking. Raw HTML insertion is not a supported workflow in standard Gmail compose, so MailPixel also offers a Chrome extension for adding tracking while composing in Gmail.